It cranks great wont start. Narrowed it down to no signal to coil packs. All grounds and wires have been checked and are good. Obd2 connects buts has no codes. Reads live data like rpms and temperature but no codes. It has fuel at the rails but the plugs are dry as a bone. Not sure if related but no dash back lights. I'm not sure but I suspect the ecm not sending the coils signals..so that would mean it's bad,but how come I can connect to it and read live data. What do yall think.